<template>
	<el-container class="home-container">
		<!-- 头部区域 -->
		<el-header>
			<div>
				<img src="../assets/heima.png" alt="">
				<span>电商后台管理系统</span>
			</div>
			<el-button type="info" @click="logout">退出</el-button>
		</el-header>
		<!-- 页面主体区域 -->
		<el-container>
			<!-- 侧边栏 -->
			<el-aside :width="isCollapse ? '64px' : '200px'">
				<!-- 导航菜单的折叠与展开按钮 -->
				<div class="btn-toggle" @click="toggleCollapse">|||</div>
				<el-menu background-color="#333744" text-color="#fff" active-text-color="#409eff" :default-active="activePath" unique-opened :collapse="isCollapse" :collapse-transition="false" router >
					<!-- 一级菜单 -->
					<el-submenu :index="item.id + ''" v-for="item in menuList" :key="item.id">
						<!-- 一级菜单的模板区域 -->
						<template slot="title">
							<!-- 图标 -->
							<i :class="iconsObj[item.id]"></i>
							<!-- 文本 -->
							<span>{{item.authName}}</span>
						</template>
						<!-- 二级菜单 -->
						<el-menu-item :index="'/' + subItem.path" v-for="subItem in item.children" :key="subItem.id" @click="saveNavState('/' + subItem.path)">
							<!-- 二级菜单的模板区域 -->
							<template slot="title">
								<!-- 图标 -->
								<i class="el-icon-menu"></i>
								<!-- 文本 -->
								<span>{{subItem.authName}}</span>
							</template>
						</el-menu-item>
					</el-submenu>
				</el-menu>
			</el-aside>
			<!-- 右侧内容主体 -->
			<el-main>
				<!-- 路由占位符 -->
				<router-view></router-view>
			</el-main>
		</el-container>
	</el-container>
</template>

<script>
export default {
  data() {
    return {
      // 菜单列表
      menuList: [],
      // 一级菜单的图标对象
      iconsObj: {
        125: 'iconfont icon-users',
        103: 'iconfont icon-tijikongjian',
        101: 'iconfont icon-shangpin',
        102: 'iconfont icon-danju',
        145: 'iconfont icon-baobiao'
      },
      // 是否折叠导航菜单
      isCollapse: false,
      // 被激活的链接地址
      activePath: ''
    }
  },
  created() {
    this.getMenuList()
    this.activePath = window.sessionStorage.getItem('activePath')
  },
  methods: {
    // 退出
    logout() {
      // 清理 token
      window.sessionStorage.clear()
      // 重新跳转到登录页
      this.$router.push('/login')
    },
    // 获取菜单列表
    async getMenuList() {
      const { data: res } = await this.$http.get('menus')
      if (res.meta.status !== 200) return this.$message.err('获取菜单列表失败')
      this.menuList = res.data
      // console.log(res)
    },
    // 切换导航菜单的折叠与展示
    toggleCollapse() {
      this.isCollapse = !this.isCollapse
    },
    // 保存链接的激活状态
    saveNavState(activePath) {
      window.sessionStorage.setItem('activePath', activePath)
      this.activePath = activePath
    }
  }
}
</script>

<style lang="less" scoped>

.home-container {
	height: 100%;

	.el-header {
		background-color: #373d41;
		padding-left: 0;
		display: flex;
		justify-content: space-between;
		align-items: center;

		> div {
			display: flex;
			align-items: center;

			> span {
				color: #fff;
				font-size: 20px;
				margin-left: 15px;
			}
		}
	}
	.el-aside {
		background-color: #333744;

		.el-menu {
			border-right: none;
		}
	}
	.el-main {
		background-color: #eaedf1;
	}
}
.iconfont {
	margin-right: 10px;
}
.btn-toggle {
	font-size: 10px;
	color: #fff;
	text-align: center;
	line-height: 24px;
	background-color: #4a5064;
	letter-spacing: .2em;
	cursor: pointer;
}
</style>
